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  <h1 class="title">简介</h1>
  <p class="simpara">
   The runkit extension provides means to modify constants,
   user-defined functions, and user-defined classes.
   It also provides for custom superglobal variables
   and embeddable sub-interpreters via sandboxing.
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  <p class="simpara">
   This package is meant as a feature added replacement for the
   <a href="http://pecl.php.net/package/classkit" class="link external">&raquo;&nbsp;classkit</a> package.
   When compiled with the <em>--enable-runkit=classkit</em>
   option to ./configure, it will export classkit compatible function definitions
   and constants.
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